Grinding machine for grinding alloy discs



9,1969 D.C.GARLITTS I 3,461,620

GRINDING MACHINE FOR GRINDING ALLOY DISCS Filed Jan. 30, 3967 4 Sheets-Sheet l INVENTOR 00/1/1410 6- GARl/TTJ' ATTOR/Vg') Aug. 19, 1969 D. c. GARLITTS GRINDING MACHINE FORGRINDING ALLOY DISCS Filed Jan. 30, 1967 4 Sheets-Sheet 2 Illlll Aug. 19, 1969 o. c. GARLITTS 3,

GRINDING MACHINE FOR GRINDING ALLOY DISCS Filed Jan. 30, 1967 4 Sheets-Sheet 3 INVENTOR DON/4 z D c. GARL 77';

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A Z'TOR/VE Y Aug. 19, 1969 D. c. GARLITTS 3,461,620

GRINDING.MACHINE FOR GRINDING ALLOY DISCS 4 Sheets-Sheet 4 Filed Jan. 30, 1967 INVENTOR. DON/H0 GIMl/I'TS fif ATTORNEY United States Patent 3,461,620 GRINDING MACHINE FOR GRINDING ALLOY DISCS Donald C. Garlitts, Braeburn, Pa., assignor to Continental Copper & Steel Industries, Inc. (Braeburn Alloys Steel Division), Braeburn, Pa., a corporation of Delaware Filed Jan. 30, 1967, Ser. No. 625,889 Int. Cl. B24b 5/00 US. Cl. 51-129 4 Claims ABSTRACT OF THE DISCLOSURE The present disclosure relates to processing of alloy discs which comprises grinding them to circular shape by pressing them against a vertical revolving grindstone.

Brief summary and general statement of the invention The present invention relates to a process of finishing alloy discs, and it particularly relates to a process for finishing alloy discs which may be used in the tool and steel industries.

Alloy discs are normally formed of combinations of iron together with hardening metals including tungsten, chromium and other toughening alloys, and they are first formed as ingots, cogged to billets and then converted into disc shape so that they may be more readily formed into drawing dies.

It is quite important that these discs have proper predetermined outside diameters so that they may be held in the construction which enables them to be used in drawing dies.

It is among the objects of the present invention to provide a system for forming alloy steel discs for drawing dies so that their external diameter may be accurately determined and so that the die may be produced with assurance of a predetermined external diameter suitable for use in drawing dies without ditficulty and excessive grinding operations.

Another object is to provide an improved method of processing alloy steel discs for drawing dies in which the external diameter may be rapidly determined by a simple grinding process without laborious, slow and costly machining operations.

Still further objects and advantages will appear in the more detailed description set forth below, it being understood, however, that this more detailed description is given by way of illustration and explanation only and not by way of limitation, since various changes therein may be made by those skilled in the art without departing from the scope and spirit of the present invention.

In accomplishing the above objects, it has been found most satisfactory according to one embodiment of the present invention first to form an ingot of the iron, tungsten or chromium drawing die alloy and then to hammer it into discs formed in an annulus so that it has the approximate height and diameter of the final disc that is to be obtained.

Normally the final disc after being formed in the ring will have a slight edge head which must be removed to cause the disc to have the proper outside dimension.

3,461,620 Patented Aug. 19, 1969 According to the preferred form of the invention, this disc is then mounted onto a rotatable base, and the entire base is then pressed up against a grinding stone annuhis so that the disc is ground on its peripheral edge with the bead removed and with the rotation of the disc and grinding thereof being simultaneously accomplished by the abrasive contact with the rotating annulus.

The disc is preferably applied to the annular grindstone at a point above the center line and about equidistant between the grinding edges of the annulus.

The angle of grinding will be about 10 to 20 on the edges of the disc so that there is a substantial elevation above the horizontal center line.

As a result, the grinding cuts will result in rotation of the disc and uniform abrasion around the peripheral area thereof, abrasive cutting being at an angle to the plane of the disc.

Brief description of the drawings With the foregoing and other objects in view, the invention consists of the novel construction, combination and arrangement of parts as hereinafter more specifically described and illustrated in the accompanying drawings, wherein is shown an embodiment of the invention, but it is to be understood that changes, variations and modifications can be resorted to which fall within the scope of the claims hereunto appended.

' In the drawings wherein like reference characters denote corresponding parts throughout the several views:

FIG. 1 is a diagrammatic top perspective view from the rear of the annular grindstone with the annular grindstone being partly broken away more clearly to show the application of the alloy disc to the grindstone during the grinding operation.

FIG. 1a is a side sectional view upon the line la-la of FIG. 1 showing the application of a. top roller to hold the alloy disc down when the grinding operation takes place.

FIG. 1b is a top view of the arm upon an enlarged scale as compared to FIG. 1.

FIG. 1c is a side view of the arm upon an enlarged scale as compared to FIG. 1.

FIG. 1d is a side elevational view of the peripheral pressure rollers upon an enlarged scale as compared to FIG. 1.

FIG. 2 is a diagrammatic front elevational view of the grind wheel showing the purpose of the application of the alloy disc thereto.

FIG. 3 is a diagrammatic side elevational view showing the application of the disc thereto.

FIG. 4 is a fragmentary transverse sectional view taken upon the line 44 of FIG. 1 upon an enlarged scale as compared to FIG. 1.

FIG. 5 is a diagrammatic top perspective view indicating the manner in which the disc to be ground is formed from the billet.

FIG. 6 shows the disc after it has been formed from the billet with the top bead.

FIG. 7 is a top perspective view showing the disc after grinding.

Description of the preferred embodiments Referring to FIG. 1, there is shown an annular grindstone A which may be mounted at its backside 10 upon a carrying plate, and it will be suitably driven through a motor or other mechanism.

These annular grindstones consist of resin abrasive material usually of synthetic origin such as Carborundum, and they may have an 18" outside diameter and a thickness of 4" in the direction 11 and a width of 4" in the dimension indicated at 12.

The alloy disc B to be ground to proper diameter may have a wide variety of dimensions, and it is carried upon the rotatable table C (see FIGS. 3 and 4) and is pressed against the grind wheel by the lever D having the edge contact rollers E and F and the top contact roller G.

The handle H permits controlled hand pressure between the disc B and the grindstone A so as to achieve the desired pressure when the abrasion takes place along the edges or periphery J.

Referring to the formation of the disc itself as shown in FIGS. and 6, the forming ring 20 has a central opening 21 and also has an external strap 22 with a handle 23.

The ingot 24 will be pounded down to fill out the space or void 25 inside the diameter 21 of the FIG. 5.

When it is removed from the ring 25, it will have an outside diameter 26 conforming to the inside diameter 21 of the forming ring 20 with a slight bead 27 which has to be removed.

This disc then may be placed upon the rotating table C on the support structure 28 of FIG. 4. The lever D is provided with the swivel mounting post 29 on one side of the structure 28 (see FIG. 1).

This support table base structure 28 as shown best in FIG. 4 may have a slot 30 adjustably carrying the head 31 with the upwardly extending post 32 and enlarged head portion 33.

The enlarged head portion 33 fits into the holder washer 34 which rests on top of the lower plate 35.

The lower plate 35 has a circular runway 36 in which the balls 37 may circulate to give a ball bearing.

The upper plate 38 of the ball bearing structure is re tained by the bevel edge 39 of the disc or washer 34.

The plate 38 has a downwardly extending flange 40 which extends down to 41 slightly above the top face 42 of the table or base 28.

Over the entire device is the cup or table bearing cover 43 having the downwardly extending peripheral edge portion 44.

The cup or cover 43 may be changed in accordance with the size of the disc to be processed.

There is a close fit at 45 so that the bearing cover 43 will turn with the upper race 38 of the ball bearings 37.

The alloy disc may then be placed upon the top surface 46 of the rotatable bearing table cover 43, and it will be held by the top roller G between its periphery and center point and pressed against the grindstone by the edge rollers E and F.

As shown best in FIG. 1, the lever D may be adjustable and pivotally mounted by a pivot pin in one of the openings in 60 in the post 29.

The arm D may be moved up and down along the direction 61 as well as inwardly and outwardly along the direction 62.

The arm is shown in detail in FIGS. 10, 1b and 1c and has a body portion 63 with a slot 64.

Into the slot 64 projects the flattened side pin or stud 65 extending upwardly from the body 66 which has a downwardly projecting bearing element 67 carrying by means of a ball bearing the roller 68.

The upwardly projecting top studs 65 may be held in position by means of the clamping screws and washers 66a once they have been set along the slot 64.

Beyond the body 63 is the extension 69 carrying the serrated or roughened handle portion 70.

At the other end of the body 63 is the projection 71 which has a pivot opening 72 to form a pivot connection with pivot pin through openings 60, so that the arm may be moved upwardly in the direction as indicated at 61 or forwardly and backwardly upon the swivel 29 in direction 62 shown in FIG. 1.

The forward projection 73 from the body 63 carries the top roller G which is held in position by means of a pivot pin 74.

By means of the rollers E and F pressing the edge I of the disc against the grinding face K of the annular grindstone A, it is possible to assure the proper contact which will result in the oblique serrations as indicated best in FIGS. 1 and 7 as the disc 8 is turned in the direction 75 by the grindstone 76.

It will be noted by reference to FIGS. 2 and 3 that the disc is mounted at angle 77 of about 15 to the above horizontal as indicated at 78 so that it will be both off center and off horizontal as the annular grindstone K is turned in the direction 76.

As soon as the bead 27 of FIG. 6 has been removed and the edge I reduced to the proper diameter, the disc B may be removed by releasing the handle D which will lift both the top roller G and the edge peripheral rollers E and F.

To obtain a fixed pressure apart from the handle H and the swinging member D, the threaded pressure member '85 with the handle 86 and the pressure end 84 may be used to press the rollers E and F against the periphery J against the disc B to give a desired grinding pressure effect upon the edge of the disc.

The threaded shaft 85 will pass through the threaded member 87 which is mounted by the base 88 upon the table 28.

Normally, however, hand pressure may be employed to achieve the desired abraded, edge effect.

In FIG. 3 there is shown the mounting plate 92 for the grind annulus A which is carried by the shaft 93.

The disc B ground in this manner as shown in FIG. 7 will have a uniform edge structure with oblique serrations extending obliquely across the edge I thereof at an angle of about 15 and will be readily mounted in die holders and will have a uniform size enabling it to be readily utilized.

The method of grinding disclosed in the present application permits grinding the edge of the alloy discs to predetermined accurate dimension with removal of the beads that are formed thereon without necessity of expensive machining operations and by relatively simple grinding operations.

There will be sufficient clearance along the bevel surface 39, the vertical surface 39a and the top surface 3% to permit the cup or cover 43 to engage plate 38 and turn freely in respect to the holder washer 34 and the lower plate 35.

Although less preferred, instead of the peripheral grinding of discs B, it is possible deburr gears and other abrasive devices may be utilized in lieu of the annular grindstone A.

The method of grinding disclosed in the present application will give a predetermined peripheral size and shape and the angle of the grind will permit most ready mounting of the disc in the tools in which they are utilized.

As many changes could be made in the above processing of alloy discs, and many widely different embodiments of this invention could be made without departing from the scope of the claims, it is intended that all matter contained in the above description shall be interpreted as to rotate said stone, a rotatable shiftable horizontal table, a horizontal carrier on said table, said carrier carrying a disc horizontally positioned upon said carrier, means to move said disc against said grindsome at a position above and to one side of said drive shaft, said last mentioned means including contact elements to contact the top and edge of the disc at the side away from the grind stone.

2. The grinding machine of claim 1, said elements including a plurality of rollers to roll on the top and edge of the disc.

3. The grinding machine of claim 1, said means including a swinging handle and said handle carrying rollers serving as said elements and the roller contacting the top of the disc being inclined so as to press said disc inwardly against the grindstone.

4. The grinding machine of claim 1,. said table including a top circular cap, a lower cap telescoped into saidtop cap, a base circular runway supporting the lower cap, ball bearing between said runway and said lower cap, a base support for said runway, and a slide connection between said base support and said runway.

References Cited UNITED STATES PATENTS 447,860 3/1891 Armstrong 51-131 1,431,876 10/1922 De Grouchy 51----236 1,434,592 11/ 1922 Crawford 51131 1,440,639 1/1923 Smith 51-129 1,913,734 6/1933 Statz 51-131 X LESTER M. SWINGLE, Primary Examiner 

